Wall Street slides, ending seesaw week in a risk-off mood

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  • Nasdaq leads losses as technology majors sink
  • S&P 500 trades close to 50-day moving average
  • Triple options expiry likely to increase volatility
  • Indexes set for weekly losses
  • Indexes down: Dow 0.49%, S&P 0.87%, Nasdaq 1.05%

NEW YORK, Sept 17 (Reuters) - Wall Street slid on Friday in a broad sell-off, rounding out a topsy-turvy week in which investors juggled signs of economic strength with concerns over corporate tax increases, stress from the Delta COVID variant, and possible shifts in the U.S. Federal Reserve's timeline for tapering asset purchases.

All three major U.S. stock indexes fell, with the Nasdaq Composite Index (.IXIC) suffering the biggest decline as rising U.S. Treasury yields pressured market-leading growth stocks.

They were also on track to post weekly losses, with the S&P index (.SPX) setting a course for its biggest two-week drop since February.

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"We're seeing a market where investors are pulling to the sidelines," said Peter Cardillo, chief market economist at Spartan Capital Securities in New York. "It's a market that's being driven by cautiousness rather than any shift in fundamentals."

A potential hike in corporate taxes could eat into earnings also weigh on markets, with leading Democrats seeking to raise the top tax rate on corporations to 26.5% from the current 21%.

While consumer sentiment steadied this month it remains depressed, according to a University of Michigan report, as Americans postpone purchases while inflation remains high. read more

Inflation is likely to be a major issue next week, when the Federal Open Markets Committee holds its two-day monetary policy meeting. Market participants will be watching closely for changes in nuance which could signal a shift in the Fed's tapering timeline.

"It has been a week of mixed economic data and we are focused clearly on what will come out of the Fed meeting next week," said Bill Northey, senior investment director at U.S. Bank Wealth Management in Helena, Montana.

The Dow Jones Industrial Average (.DJI) fell 170.15 points, or 0.49%, to 34,581.17; the S&P 500 (.SPX) lost 38.97 points, or 0.87%, at 4,434.78; and the Nasdaq Composite (.IXIC) dropped 159.70 points, or 1.05%, to 15,022.22.

The S&P 500 dropped close to its 50-day moving average, which in recent history has proven a rather sturdy support level.

50-DMA tends to be a major support level for index

Of the 11 major sectors in the S&P 500 materials (.SPLRCM) and technology shares (.SPLRCT) were suffering the biggest percentage drops.

COVID vaccine manufacturers Pfizer Inc (PFE.N) and Moderna Inc (MRNA.O) dropped 1.3% and 4.8%, respectively, as U.S. health officials moved the debate over booster doses to a panel of independent experts. read more

U.S. Steel Corp (X.N) shed 8.6% after it unveiled a $3 billion mill investment plan.

Robinhood Markets Inc (HOOD.O) rose 1.5% after Cathie Wood's ARK Invest bought $14.7 million worth of shares in the trading platform.

Volume and volatility is likely elevated toward the end of the session due to "triple witching," which is the quarterly, simultaneous expiration of stock options, stock index futures, and stock index options contracts.

Declining issues outnumbered advancing ones on the NYSE by a 2.18-to-1 ratio; on Nasdaq, a 1.24-to-1 ratio favored decliners.

The S&P 500 posted seven new 52-week highs and two new lows; the Nasdaq Composite recorded 57 new highs and 60 new lows.

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Reporting by Stephen Culp; Additional reporting by Krystal Hu in New York and Ambar Warrick in Bengaluru; Editing by Richard Chang

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